Twice this week while driving, with top down, the passenger door has unlocked and unlatched itself. I see the warning message on the dash message screen and my wife in the passenger seat hears a ka-thunk which is apparently the unlock/unlatch. The safety latch prevents the door from swinging open but it is unnerving, to say the least. The first time was three days ago and I accounted for it as simply a door not fully closed when entering. Now I know that it is something else. Both times with top down and both times after going over a road bump. Not too much of a bump. Passenger door only. I had already scheduled the 37.5 service for tomorrow so they will definitely hear from me on this but my guess is that "unable to duplicate/no bulletin" response. I checked the web and there are only 3 other examples I could find of people reporting this kind of incident. Any ideas here?